Indian locomotive class WM

The Indian locomotive class WM was a class of 2-6-4T tank locomotives used on 5 ft 6 in (1,676 mm) broad gauge lines in India from 1942.[2][4][5] A total of 70 of them were delivered new, and another four were converted from existing class WV engines.[1]

Indian WM
Vulcan Foundry works photo of EIR no. 2211.
Vulcan Foundry works photo of EIR no. 2211.
Type and origin
Power typeSteam
Builder
Build date1939, 1951, 1953, 1954
Total produced
  • 70 new
  • 4 ex WV
Specifications
Configuration:
​
 • Whyte2-6-4T
 • UIC1′C2′h2t
Gauge5 ft 6 in (1,676 mm)
Driver dia.5 ft 7 in (1,702 mm)
Axle load16.25 long tons (16.51 t; 18.20 short tons)
Loco weight96.6 long tons (98.2 t; 108.2 short tons)
Fuel typeCoal
Fuel capacity6.5 long tons (6.6 t; 7.3 short tons)
Water cap.3,000 imp gal (14,000 L; 3,600 US gal)
Firebox:
 • Firegrate area		24.6 sq ft (2.29 m2)
Boiler pressure210 psi (1.45 MPa)
Heating surface965 sq ft (89.7 m2)
Superheater:
​
 • TypeAX pattern (21 A-type elements)
 • Heating area230 sq ft (21 m2)
CylindersTwo, outside
Cylinder size16 in × 28 in (406 mm × 711 mm)
Valve gearWalschaerts
Performance figures
Tractive effort19,100 lbf (84.96 kN)
Factor of adh.5.68
Career
OperatorsIndian Railways
Number in class70 + 4
Numbers13000–13073
[1][2][3]

The ten prototypes of the WM class, the first 30 production units, and the four WV class locomotives that were later converted to WMs, were built by Vulcan Foundry in Newton-le-Willows, Lancashire, England. The remaining 30 WM class engines were built by Robert Stephenson and Hawthorns in North East England.[1]

Class table
Table of orders and numbers
YearManufacturerSerial Nos.QtyFirst Nos.All-India Nos.Notes
1942Vulcan4795-48041013000–13009Prototypes
1951Vulcan6096-61253013010–13039
Robert Stephenson and Hawthorns3013040–13069
Vulcan4787-4790413070–13073Converted from WV

See also

References

Notes
  1. Hughes 1996, p. 23.
  2. "Indian Railways 5 ft. 6 in. Gauge 1952 2-6-4T (WM) brochure" (PDF). Vulcan Foundry. Archived from the original (PDF) on 19 October 2013. Retrieved 11 July 2013.
  3. "Indian Government Railways Thirty 2-6-4 Type, "WM" Class Side Tank Locomotives 5 ft. 6 in. Gauge". Vulcan Magazine. Vulcan Foundry. 2 (4): 16–17. December 1951. Archived from the original on 30 October 2013. Retrieved 11 July 2013.
  4. Hughes 1976, p. 21.
  5. Marshall 2009, pp. 88.

Bibliography
  • Hughes, Hugh (1976). Steam in India. Truro, Cornwall: D. Bradford Barton Ltd. ISBN 0851532586.
  • Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9521655-1-1. OCLC 35135033.
  • Marshall, Lawrence G (2009). Indian Broad Gauge Steam Remembered. East Harling, Norfolk: Taverner Publications. ISBN 9781901470154.

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